Update Deoplete configuration snippet

Author: finalfantasia

README.md

@@ -25,11 +25,10 @@ your favourite plugin manager, mine is [vim-plug][]
 Plug 'clojure-vim/async-clj-omni'
 ```
 
-You also need to include the following lines in your init.vim:
+You also need to include the following line in your init.vim:
 
 ```vim
-let g:deoplete#keyword_patterns = {}
-let g:deoplete#keyword_patterns.clojure = '[\w!$%&*+/:<=>?@\^_~\-\.#]*'
+call deoplete#custom#option('keyword_patterns', {'clojure': '[\w!$%&*+/:<=>?@\^_~\-\.#]*'})
 ```
 
 As I improve them, they may be PR'd into deoplete.vim, but I'm not yet